Construction Of Multi-component 2D Assemblies Structure Based On Hydrogen Bond

Supramolecular self-assembly is an effective approach to construct two-dimensional functional surface material Self-assembly of ordered monolayers at the liquid-solid interface has been proven to be well suited for functionalizing surfaces and,especially porous networks,which can be utilized as supramolecular host systems for defined coadsorption of nanoscale guests,have received broad interest.The monolayer morphology is primarily governed by the structure and functional groups of the molecule,but can also depend on the type of solvent,temperature,concentration,substrate,interactions,and other factors.(?)The formation process of multicomponent 2D assemblies of C2v-symmetric terphenyl tetracarboxylic acid on surface.We report on the two-dimensional self-assembly of C2v-symmetric[1,1':3',1"-terphenyl]-3,3,",5,5"-tetracarboxylic acid(TPTA)at the solid/liquid interface by using scanning tunneling microscopy(STM).Two kinds of different self-assembly structure i.e.close-packed and porous rosette structure are formed by TPTA molecules through intermolecular hydrogen bonds.When adding coronene(COR)as a guest into TPTA assembly,the structural transformation from densely packed row structure to rosette network structure is observed.It was found that two kinds of cavities with different sizes in the rosette network structure can be used to realize the selective co-adsorption of guest molecules with appropriate shape and size.Three-component 2D host-guest structures were successfully constructed by using 1,2,3,4,5,6-Hexakis(4-bromophenyl)benzene(HBPBE)and Copper phthalocyanine(CuPc)as guest molecules.(?)The solvent effect of the self-assembly of 3,5-dicarboxylic phenylboric acid molecules on HOPG surface.We study the self-assembly of 3,5-dicarboxylic phenylboric acid molecules containing double heterostructure on HOPG surface.It is composed of two functional groups,carboxyl and boric acid.The 3,5-dicarboxylic phenylboric acid can form hydrogen bonds through its own carboxyl groups.We tried to control the assembly structure by different solvent properties,and found that it is densely packed in tetrahydrofuran and opened networks in octanoic acid.we speculate that in the solvent control process,the intermediate containing the hexagon ring of B-O will be generated in the octanoic acid.At the same time,we selected the H6BHB molecule for the control experiment and constructed the main molecule with the benzene molecule.Object co-assembly structure.Two-component 2D host-guest structures were successfully constructed by using coronene as guest molecules.(?)The effect of the amino activity of TAP molecules for the self-assembly and imine-based covalent organic frameworks.We change the symmetry of the molecule and the amino group activity by introducing electron-absorbing groups on the benzene ring.Herein,we selected the TAP molecules containing amino group activity is different.It can form an N…O-H hydrogen bond with barbiturate on the surface,and zigzag ridges pattern can be obtained under the condition of 1:3 stoichiometric ratio.The coupling reactions between TAP groups and rigid aromatic cores are achieved by well-established in situ interfacial imine reactions between aldehyde groups on the rigid molecules cores and the amine groups of TAP To investigate the molecules with different amino activity on surface synthesis of imine-based covalent organic frameworks and self-assembly structure.